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IL-13Rα2 is closely related to IL-13Rα1, a subunit of the interleukin-13 receptor complex. This protein binds IL13 with high affinity, but lacks any significant cytoplasmic domain, and does not appear to function as a signal mediator. It is, however able to regulate the effects of both IL-13 and IL-4, despite the fact it is unable to bind directly to the latter. It is also reported to play a role in the internalization of IL13.[1]